Bumping an old thread here, but it seems to be the place to discuss...
My alkalinity measures 22 dKH, confirmed on two different branded tests, on a freshly mixed pail of Instant Ocean from RO water at 24 C.
I bought some snails from a marine pet store and but their water to the same tests, which came out to 28 dKH.
Both of my aquariums seem to run at ~20-22 by these tests and all inhabitants seem to be happy.
What is going on here? Is it as simple as dividing by 2
?